Answer the following. (a) What is the surface temperature ofBetelgeuse, a red gi

Question

Answer the following. (a) What is the surface temperature ofBetelgeuse, a red giant star in the constellation of Orion, whichradiates with a peak wavelength of about 970 nm?
K

(b) Rigel, a bluish-white star in Orion, radiates with a peakwavelength of 145 nm. Find the temperature of Rigel's surface.
K (a) What is the surface temperature ofBetelgeuse, a red giant star in the constellation of Orion, whichradiates with a peak wavelength of about 970 nm?
K

(b) Rigel, a bluish-white star in Orion, radiates with a peakwavelength of 145 nm. Find the temperature of Rigel's surface.
K

Explanation / Answer

peak wavelength = 970 nm                              =970 * 10 ^ -9 m temp of the surface T = b / where b = wein,s constant = 0.2896 * 10 ^ -2 mK So, T = 2985.5 K (b). In this case = 145 nm                            = 145 * 10 ^ -9 m So, temp of the star = 1.99 * 10 ^ 4 K

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